新疆钢铁公司炼钢厂的氧气顶吹转炉的除尘引风采用上海鼓风机厂生产的D250-11煤气鼓风机.风机发生故障后曾四次发现叶轮轴φ480轴颈严重磨损,采用了焊补工艺修复.由于未经热处理,重新车制后的φ80轴颈端热应力集中.经几个周期使用后探伤发现,三个焊补修复的叶轮轴在φ80轴颈端均出现周向裂纹,且有一叶轮轴在运行中突然从轴颈端断裂. D250-11 gas blower produced by Shanghai Blower Factory was used for dust removal of oxygen top-blown converter in Xinjiang Iron & Steel Co. Steel mill. The shaft of φ480 impeller was severely worn four times after fan failure, and repaired by welding and repairing process. As without heat treatment, re-made after the φ80 shaft neck end thermal stress concentration.After several cycles of testing found that the three welding repaired impeller shaft in the φ80 axial shaft ends are cracks, and an impeller shaft Suddenly broke from the journal end during operation.